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Transition form factors of the Λb→Λ(1520) in QCD light-cone sum rules
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Journal Article
Transition form factors of the Λb→Λ(1520) in QCD light-cone sum rules
2025
Overview
In this work, we investigate the transition form factors for
Λ
b
→
Λ
(
1520
)
within the framework of light-cone sum rules (LCSR), using the light-cone distribution amplitudes (LCDAs) of the
Λ
b
-baryon. In the hadronic representation of the correlation function, we carefully select the appropriate Lorentz structures and isolate the contributions from both the
Λ
(
1520
)
(
J
P
=
(
3
/
2
)
-
)
and the
Λ
(
1890
)
(
J
P
=
(
3
/
2
)
+
)
,
ensuring that the form factors for
Λ
b
→
Λ
(
1520
)
can be calculated unambiguously. We also provide predictions for various physical observables in the decay
Λ
b
→
Λ
(
1520
)
l
+
l
-
,
including the differential branching fraction, the lepton-side forward–backward asymmetry, the longitudinal polarization fraction, and the CP-averaged normalized angular observable. Our prediction for the differential branching fraction of
Λ
b
→
Λ
(
1520
)
μ
+
μ
-
is in good agreement with the LHCb measurement within the uncertainties.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
